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Air-Gas proportions

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JC Uknz11/01/2010 08:47:55
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141 forum posts
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I'm organising a gas fire for a boiler.   The main problem is that the flames are creating a lot of soot under and up the sides of the horizontal boiler.  I'm sure from a vague memory from when I was thinking of Garden Railway steam power it has something to do with the amount of air being mixed with the gas [ small Kovea tank  Butane/Protane mix]  
 
I'm hoping somebody can guide me to save hunting through magazine after magazine, if I still have it.
 
My sympathies with you in the Northern hemisphere with all the snow dump .. I hope you still have power to spend time heating yourselves and working the computer even if you can't go to work.
JC Uknz13/01/2010 19:08:12
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141 forum posts
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I thought I would find an abundance of helpful folk who knew all the answers
 
Whatever in my latest bench tests I discovered that by increasing the pressure* from the supply tank I got a better 'burning flame' ... more blue than yellow .... hotter.   This is with a new burner tube with a 0.5mm jet size [ an older NBG jet which I cleaned out] and 2mm holes in the tube rather than saw cuts.    Putting my fingers over to block the air holes so I am burning pure gas results in a yellow flame.
 
*Previously with a full [new] tank I barely opened the gas cock [ Stuart Turner call it a regulator] to get the height of flame needed to heat the boiler.
JC Uknz13/01/2010 19:13:41
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141 forum posts
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regarding to my avatar the boat pictured has undergone a further rebuild and now looks something like the German coastal defence trawler featured in Model Boats a few months ago.   The hull is an 'Isle's Class' Trawler, now must be a good ten years old and this is the second rebuild .. maybe one day I will attempt to build her according to the lovely plans that came with the hull
geoffrey yarham22/01/2010 21:28:53
42 forum posts
77 photos
How many 2mm holes in you burner? I am having  trouble keeping all the flames lit. Hammer. 

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